arch/mips/sgi-ip27/ip27-reset.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Reset an IP27.
   7  *
   8  * Copyright (C) 1997, 1998, 1999, 2000, 06 by Ralf Baechle
   9  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/timer.h>
  14 #include <linux/smp.h>
  15 #include <linux/mmzone.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/pm.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/irq.h>
  21 #include <asm/reboot.h>
  22 #include <asm/sgialib.h>
  23 #include <asm/sn/addrs.h>
  24 #include <asm/sn/arch.h>
  25 #include <asm/sn/gda.h>
  26 #include <asm/sn/sn0/hub.h>
  27
  28 void machine_restart(char *command) __attribute__((noreturn));
  29 void machine_halt(void) __attribute__((noreturn));
  30 void machine_power_off(void) __attribute__((noreturn));
  31
  32 #define noreturn while(1);                              /* Silence gcc.  */
  33
  34 /* XXX How to pass the reboot command to the firmware??? */
  35 static void ip27_machine_restart(char *command)
  36 {
  37 #if 0
  38         int i;
  39 #endif
  40
  41         printk("Reboot started from CPU %d\n", smp_processor_id());
  42 #ifdef CONFIG_SMP
  43         smp_send_stop();
  44 #endif
  45 #if 0
  46         for_each_online_node(i)
  47                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  48                                                         PROMOP_REBOOT);
  49 #else
  50         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  51 #endif
  52         noreturn;
  53 }
  54
  55 static void ip27_machine_halt(void)
  56 {
  57         int i;
  58
  59 #ifdef CONFIG_SMP
  60         smp_send_stop();
  61 #endif
  62         for_each_online_node(i)
  63                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  64                                                         PROMOP_RESTART);
  65         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  66         noreturn;
  67 }
  68
  69 static void ip27_machine_power_off(void)
  70 {
  71         /* To do ...  */
  72         noreturn;
  73 }
  74
  75 void ip27_reboot_setup(void)
  76 {
  77         _machine_restart = ip27_machine_restart;
  78         _machine_halt = ip27_machine_halt;
  79         pm_power_off = ip27_machine_power_off;
  80 }